diff --git a/Src/Asp.Net/PgSqlTest/Demo/Demo3_Insertable.cs b/Src/Asp.Net/PgSqlTest/Demo/Demo3_Insertable.cs
index dd7e51b37..bcc976aa3 100644
--- a/Src/Asp.Net/PgSqlTest/Demo/Demo3_Insertable.cs
+++ b/Src/Asp.Net/PgSqlTest/Demo/Demo3_Insertable.cs
@@ -52,6 +52,94 @@ namespace OrmTest
             //Use Lock
             db.Insertable(insertObj).With(SqlWith.UpdLock).ExecuteCommand();
 
+
+            db.CodeFirst.InitTables<RootTable0, TwoItem, TwoItem2, TwoItem3>();
+            db.CodeFirst.InitTables<ThreeItem2>();
+            db.DbMaintenance.TruncateTable("RootTable0");
+            db.DbMaintenance.TruncateTable("TwoItem");
+            db.DbMaintenance.TruncateTable("TwoItem2");
+            db.DbMaintenance.TruncateTable("TwoItem3");
+            db.DbMaintenance.TruncateTable("ThreeItem2");
+            Console.WriteLine("SubInsert Start");
+
+            db.Insertable(new Order()
+            {
+                Name = "订单 1",
+                CustomId = 1,
+                Price = 100,
+                CreateTime = DateTime.Now,
+                Id = 0,
+                Items = new List<OrderItem>() {
+                      new OrderItem(){
+                           CreateTime=DateTime.Now,
+                           OrderId=0,
+                            Price=1,
+                             ItemId=1
+                       },
+                      new OrderItem(){
+                           CreateTime=DateTime.Now,
+                           OrderId=0,
+                            Price=2,
+                             ItemId=2
+                       }
+                 }
+            })
+            .AddSubList(it => it.Items.First().OrderId).ExecuteCommand();
+
+
+
+            db.Insertable(new List<RootTable0>() {
+                new RootTable0()
+            {
+                 Name="aa",
+                   TwoItem2=new TwoItem2() {
+                      Id="1",
+                       ThreeItem2=new List<ThreeItem2>(){
+                            new ThreeItem2(){ Name="a", TwoItem2Id="1" },
+                            new ThreeItem2(){ Id=2, Name="a2", TwoItem2Id="2" }
+                        }
+                   },
+                   TwoItem=new TwoItem()
+                   {
+                       Name ="itema" ,
+                       RootId=2
+                   },
+                   TwoItem3=new List<TwoItem3>(){
+                       new TwoItem3(){  Id=0, Name="a",Desc="" },
+
+                   }
+            },
+                new RootTable0()
+            {
+                 Name="bb",
+                   TwoItem2=new TwoItem2() {
+                      Id="2"
+                  },
+                    TwoItem=new TwoItem()
+                   {
+                       Name ="itemb" ,
+                       RootId=2,
+
+                   },
+                    TwoItem3=new List<TwoItem3>(){
+                       new TwoItem3(){ Id=1, Name="b",Desc="" },
+                              new TwoItem3(){ Id=2, Name="b1",Desc="1" },
+                   }
+            }
+            })
+           .AddSubList(it => it.TwoItem.RootId)
+           .AddSubList(it => new SubInsertTree()
+           {
+               Expression = it.TwoItem2.RootId,
+               ChildExpression = new List<SubInsertTree>() {
+                       new SubInsertTree(){
+                            Expression=it.TwoItem2.ThreeItem2.First().TwoItem2Id
+                       }
+                  }
+           })
+           .AddSubList(it => it.TwoItem3)
+           .ExecuteCommand();
+
             Console.WriteLine("#### Insertable End ####");
         }
     }
diff --git a/Src/Asp.Net/PgSqlTest/Models/SubInsertTest.cs b/Src/Asp.Net/PgSqlTest/Models/SubInsertTest.cs
new file mode 100644
index 000000000..702f93a93
--- /dev/null
+++ b/Src/Asp.Net/PgSqlTest/Models/SubInsertTest.cs
@@ -0,0 +1,108 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    public class RootTable0
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey =true,IsIdentity =true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+        [SqlSugar.SugarColumn(IsIgnore =true)]
+        public TwoItem TwoItem { get; set; }
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public TwoItem2 TwoItem2 { get; set; }
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public List<TwoItem3> TwoItem3 { get; set; }
+    }
+    public class TwoItem
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+        public int RootId { get; set; }
+        public string Name { get; set; }
+    }
+    public class TwoItem2
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true)]
+        public string Id { get; set; }
+        public int RootId { get; set; }
+        [SqlSugar.SugarColumn(IsIgnore =true)]
+        public List<ThreeItem2> ThreeItem2 { get; set; }
+    }
+    public class TwoItem3
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true)]
+        public int Id { get; set; }
+        public string  Name { get; set; }
+        public string Desc { get; set; }
+    }
+    public class ThreeItem2
+    {
+       [SqlSugar.SugarColumn(IsPrimaryKey = true)]
+
+        public int  Id { get; set; }
+        public string Name { get; set; }
+        public string TwoItem2Id { get; set; }
+    }
+
+    public class Country
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public List<Province> Provinces { get; set; }
+    }
+
+    public class Province
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey =true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public int CountryId { get; set; }
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public List<City> citys { get; set; }
+    }
+
+    public class City
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true)]
+        public int Id { get; set; }
+        public int ProvinceId { get; set; }
+        public string Name { get; set; }
+    }
+
+
+    public class Country1
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true,IsIdentity =true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public List<Province1> Provinces { get; set; }
+    }
+
+    public class Province1
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true,IsIdentity =true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public int CountryId { get; set; }
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public List<City1> citys { get; set; }
+    }
+
+    public class City1
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true,IsIdentity =true)]
+        public int Id { get; set; }
+        public int ProvinceId { get; set; }
+        public string Name { get; set; }
+    }
+}
diff --git a/Src/Asp.Net/PgSqlTest/PgSqlTest.csproj b/Src/Asp.Net/PgSqlTest/PgSqlTest.csproj
index f7a972a05..9998f37ad 100644
--- a/Src/Asp.Net/PgSqlTest/PgSqlTest.csproj
+++ b/Src/Asp.Net/PgSqlTest/PgSqlTest.csproj
@@ -92,6 +92,7 @@
     <Compile Include="Models\MyCustomAttributeTable.cs" />
     <Compile Include="Models\Order.cs" />
     <Compile Include="Models\OrderItem.cs" />
+    <Compile Include="Models\SubInsertTest.cs" />
     <Compile Include="Models\TestTree.cs" />
     <Compile Include="Models\Tree.cs" />
     <Compile Include="Models\ViewOrder.cs" />
diff --git a/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs b/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs
index 230a54e78..32fede984 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs
@@ -201,7 +201,15 @@ namespace SqlSugar
                             int id = 0;
                             if (isIdentity)
                             {
-                                id = this.Context.Insertable(insert).AS(tableName).ExecuteReturnIdentity();
+                                if (this.Context.CurrentConnectionConfig.DbType == DbType.PostgreSQL)
+                                {
+                                    var sqlobj = this.Context.Insertable(insert).AS(tableName).ToSql();
+                                    id = this.Context.Ado.GetInt(sqlobj.Key+ "  "+ entityInfo.Columns.First(it=>isIdentity).DbColumnName, sqlobj.Value);
+                                }
+                                else
+                                {
+                                    id = this.Context.Insertable(insert).AS(tableName).ExecuteReturnIdentity();
+                                }
                                 if (this.Context.CurrentConnectionConfig.DbType == DbType.Oracle&&id==0)
                                 {
                                     var seqName=entityInfo.Columns.First(it => it.OracleSequenceName.HasValue())?.OracleSequenceName;